nativeMain.okio.FileSink.kt Maven / Gradle / Ivy
/*
* Copyright (C) 2020 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package okio
import kotlinx.cinterop.CPointer
import kotlinx.cinterop.addressOf
import kotlinx.cinterop.usePinned
import okio.Buffer.UnsafeCursor
import platform.posix.FILE
import platform.posix.errno
import platform.posix.fclose
import platform.posix.fflush
/** Writes bytes to a file as a sink. */
internal class FileSink(
private val file: CPointer
) : Sink {
private val unsafeCursor = UnsafeCursor()
private var closed = false
override fun write(
source: Buffer,
byteCount: Long
) {
require(byteCount >= 0L) { "byteCount < 0: $byteCount" }
require(source.size >= byteCount) { "source.size=${source.size} < byteCount=$byteCount" }
check(!closed) { "closed" }
var byteCount = byteCount
while (byteCount > 0) {
// Get the first segment, which we will read a contiguous range of bytes from.
val cursor = source.readUnsafe(unsafeCursor)
val segmentReadableByteCount = cursor.next()
val attemptCount = minOf(byteCount, segmentReadableByteCount.toLong()).toInt()
// Copy bytes from that segment into the file.
val bytesWritten = cursor.data!!.usePinned { pinned ->
variantFwrite(pinned.addressOf(cursor.start), attemptCount.toUInt(), file).toLong()
}
// Consume the bytes from the segment.
cursor.close()
source.skip(bytesWritten)
byteCount -= bytesWritten
// If the write was shorter than expected, some I/O failed.
if (bytesWritten < attemptCount) {
throw errnoToIOException(errno)
}
}
}
override fun flush() {
if (fflush(file) != 0) {
throw errnoToIOException(errno)
}
}
override fun timeout(): Timeout = Timeout.NONE
override fun close() {
if (closed) return
closed = true
if (fclose(file) != 0) {
throw errnoToIOException(errno)
}
}
}